diff --git a/package/android/build.gradle b/package/android/build.gradle
index 767b98c..eab7b2f 100644
--- a/package/android/build.gradle
+++ b/package/android/build.gradle
@@ -19,7 +19,14 @@ def isNewArchitectureEnabled() {
 }
 
 apply plugin: "com.android.library"
-apply plugin: 'org.jetbrains.kotlin.android'
+// AGP 9 ships built-in Kotlin support and registers the `kotlin` extension
+// itself. Applying the Kotlin plugin on top of it fails configuration with
+// "Cannot add extension with name 'kotlin'". Only apply it when nothing has
+// registered that extension yet.
+if (project.extensions.findByName('kotlin') == null) {
+  apply plugin: 'org.jetbrains.kotlin.android'
+}
+
 apply from: '../nitrogen/generated/android/NitroPay+autolinking.gradle'
 apply from: "./fix-prefab.gradle"